What is TrueNAS writing all the time to disk?

Submitted ⁨⁨6⁩ ⁨months⁩ ago⁩ by ⁨acockworkorange@mander.xyz⁩ to ⁨selfhosted@lemmy.world⁩

I have a TrueNAS install with SMB turned on and nothing else. Even when it’s idle and nothing is accessing it, there’s constant disk activity. Very low bandwidth, but it’s like some log is in verbose mode.

TrueNAS is installed in a NVMe disk with plenty of room, and there’s only one pool. I’ve checked my snapshot configuration, nothing enabled faster than daily.

What could be causing it? How do I stop it or redirect it to the NVMe drive? I’m willing to create a partition on the NVMe drive if that’s what will do it.

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JASN_DE@lemmy.world ⁨6⁩ ⁨months⁩ ago
That’s most likely the syslog. Check the settings, you can choose the volume to use for it.

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- catloaf@lemm.ee ⁨6⁩ ⁨months⁩ ago
  Or set up a ramdisk, or turn off log to disk entirely somehow. But if you do that, you’ll lose logs between reboots or crashes, making troubleshooting harder.
  
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tinsuke@lemmy.world ⁨6⁩ ⁨months⁩ ago
Every 4-5 seconds? Yeah, logging.

You can either move the system dataset to your boot drive/pool or syslog to /var/log:

www.truenas.com/docs/…/settingthesystemdataset/

I’ve seem many users recommend a reboot after changing those settings.

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CondorWonder@lemmy.ca ⁨6⁩ ⁨months⁩ ago
If it’s logs, there’s a package called log2ram - it’s designed for small form factor systems to reduce writes to SD cards but does apply anywhere you want to log but not hit disk immediately. It syncs logs to disk on a regular basis so you don’t lose much if the system crashes.

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- acockworkorange@mander.xyz ⁨6⁩ ⁨months⁩ ago
  Ooh that sounds promising, thank you!
  
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Darkassassin07@lemmy.ca ⁨6⁩ ⁨months⁩ ago
Dirty secrets about you.

Image

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friend_of_satan@lemmy.world ⁨6⁩ ⁨months⁩ ago
Have you run lsof? See also: www.brendangregg.com/linuxperf.html

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pyrosis@lemmy.world ⁨6⁩ ⁨months⁩ ago
Probably these directories…

/tmp /var/tmp /var/log

Two are easy to migrate to tmpfs if you are trying to reduce disk writes. Logs can be a little tricky because of the permissions. It is worth getting it right if you are concerned about all those little writes on an SSD. Especially if you have plenty of memory.

This is filesystem agnostic btw so the procedure can apply to other filesystems on Linux operating systems.

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